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The Enzyme Kinetics of NADH Dehydrogenase After the Addition

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The Enzyme Kinetics of NADH Dehydrogenase After the Addition Journal of Experimental Microbiology and Immunology (JEMI) Vol. 7:7-13 Copyright © April 2005, M&I UBC The Enzyme Kinetics of NADH Dehydrogenase After the Addition of the Inhibitory Molecules, EDTA and Mg2+ JI HAE CHUNG, PANAGIOTIS KARAGEORGIOU, PATRICK YANG, NELSON YANG, AND FRANCES LEVITT Department of Microbiology and Immunology, UBC The oxidation of NADH to NAD+ is done by NADH dehydrogenase, a component of the electron transport chain in Escherichia coli. It has been demonstrated that when E. coli K12 cells were lysed by the lysozyme lysis method, NADH dehydrogenase activity was inhibited. On the contrary, when cells were lysed by French press, NADH dehydrogenase activity was not inhibited. In our investigation, some common components used in cell lysis were examined for their effect on purified NADH dehydrogenase activity. Attempts to partially purify the enzyme to eliminate contaminating factors were unsuccessful and potential causes were examined. It was found that individually, EDTA and MgCl2 both inhibited the activity of NADH dehydrogenase. However, the pattern in the kinetics of inhibition of EDTA and MgCl2 were different and MgCl2 appeared to be a stronger inhibitor of the enzyme at lower concentrations and limiting substrate levels. _______________________________________________________________ Previous studies used crude extracts of clarified environment. However, in addition to the stresses supernatants. These extracts were potentially a problem induced on the cells in the French press protocol, high because interference of NADH dehydrogenase by pressures generate heat that may result in inactivated components of the raw lysate could have been and denatured proteins. As well, NADH dehydrogenase significant. As well, although NADH dehydrogenase is an enzyme embedded in the cellular membrane and activity can still be measured from the lysate of cells improper operations of the French press may result in broken by the French press method, this measured large chunks of membranes remaining unbroken, activity may not be optimal and therefore, investigating containing the enzyme, that will end up in the pellet the lysozyme lysis method is critical. We aimed to when centrifuging out the cellular debris. obtain a purer form of NADH dehydrogenase to avoid Inhibition of the interaction of key co-factor ions such interference. This was attempted with the use of with NADH dehydrogenase by the chelating capability the Diethylaminoethyl (DEAE)-cellulose ion exchange of EDTA, accounts for the major caveat of the chromatography column. Ion exchange lysozyme lysis method. Therefore, with the results chromatography is based on the fact that proteins are from our experiment, a future design of a modified ionically charged, and will interact with any material in lysozyme lysis method can be determined such that the solution that has opposite charge. The protein with inhibition of the activity of NADH dehydrogenase is stronger charge affinity will bind longer than ones with minimal. weak affinity and therefore changing the ionic strength MATERIALS AND METHODS of the buffer will elute the bound materials at differing Bacterial Cell Culture and Growth: E. coli K12 B23 was grown in a standard LB medium (10g Tryptone, 5g yeast extract and concentrations. 10g NaCl per liter of water) to an early-late log phase (5 hrs). Using this pure form of the NADH dehydrogenase, Harvest was done by spinning the cells at 5,000 rpm for 10 minutes. we can investigate the kinetics and inhibitory The pellet was resuspended in 25 ml TS50G (50mM Tris Hcl pH 7.9, characteristics of the enzyme by EDTA and Mg2+ and 50 mM Nacl, 10% glycerol) to prepare for cell breakage. Cell Breakage: The resuspended cell pellet was passed through provide their comparison that will lead to future the Y110L Microfluidizer (Duong Lab, Univeristy of British experiments to further optimize the extraction of the Columbia) at 15,000 psi until the suspension became less viscous (~ enzyme from intact cells using the lysozyme lysis 4 passes).The lysate was then centrifuged at 10,000 rpm for 10 minutes to remove cellular debris, the supernatant was collected for method. This method involves using EDTA and MgCl 2 solubization. to aid in the disruption of cell membranes by lysozyme. Membrane Solubilization: The supernatant after cell breakage Gram-negative cells are incubated with lysozyme and was treated with a final concentration of 1% Triton X-100. The are slowly broken by agitating the mixture over a solution was incubated at 4˚C for 1 hr under constant rotation. The period of time until it becomes viscous, indicating cell solution was centrifuged at 48,800 x g for 1 hr to remove any unsolubilized membrane. One hundred µM DTT was added to the breakage and DNA release. In comparison, French supernatant and kept for further purification/enzyme assays. press uses mechanical energy to lyse cells, where DEAE-Cellulose Ion Exchange Purification of Enzyme: Tris bacterial cells are subject to a shift from a high- buffer (10mM Tris, pH 8, 1 litre) and TN10 buffer (10mM Tris, pH pressure environment to a normal atmospheric pressure 8.0 and 1M NaCl) was used to prepare a series of different buffers 7 Journal of Experimental Microbiology and Immunology (JEMI) Vol. 7:7-13 Copyright © April 2005, M&I UBC FIG. 1 Bradford standard curve with known concentration of BSA. with different ionic strengths: TN1, TN2, TN4, TN6, TN8. Samples and therefore, we used this technique in order to were loaded in Vivapure minispin DH membrane spin columns (Cat# examine the extent of inactivation of EDTA, Mg2+, and VS-IX01DH24, Vivascience Sartorius Group Inc., Edgewood, NY, USA). All centrifugations were at 5000 x g for 2 minutes. Filtrate polymixin B post lysis. was pooled and saved for Bradford and enzyme assays. The column Upon completion of the Bradford assay, we have was then subsequently washed with increasing concentrations of TN measured the protein concentration of the lysate after buffers. TN samples were saved for Bradford and enzyme assays (8). solubilization and centrifugation to be 12 mg/ml. The Bradford Assay: Protein was measured with the Bradford dye reagent, Coomasie Blue G-250 biding assay with chicken egg high level of proteins within the lysate indicated that albumin as the standard (8). the cell breakage mechanism was sufficient to release NADH dehydrogenase Activity Assay: The assay for NADH the proteins from the cells. dehydrogenase was based on the observation that NADH absorbs Partial purification of NADH dehydrogenase with light at 340nm but NAD does not. This means that a tube containing NADH and NAD dehydrogenase should show a decrease in DEAE cellulose ion exchange column was absorbance which is inversely proportional to the amount of enzyme unsuccessful. In order to avoid loss of NADH converting the NADH to NAD. The spectrophotometer was blanked dehydrogenase recovery from the lysate, the removal of with 1.35 ml of 50 mM Tris-HCl buffer, pH 7.4 and 1.5 ml of dH2O. cellular debris was incubated with Triton X-100. Triton One hundred µl of 5 mg/ml NADH (Sigma) was added to bring the X-100 is a non-ionic detergent that has the ability to absorbance (A340) to 0.6. To each reaction tube, 100 µl of sample was added. The absorbance was continuously monitored in intervals of solubilize membranes, and therefore, release any five minutes using the SpecX software (Vernier Inc, Seattle) (8). membrane coated NADH dehydrogenase in the solution (5). The intent was to partially purify NADH RESULTS/DISCUSSION dehydrogenase in order to perform inhibition assays on a purer form of the enzyme containing higher activity. The aerobic respiratory chain of Escherichia coli is The purification of NADH dehydrogenase by means of composed of a number of membrane-bound, multi- DEAE-cellulose ion exchange chromatography was not subunit enzymes, including nicotinamide adenine successful in our investigation. Sufficient enzyme dinucleotide (NADH) dehydrogenase (type I activity was only observed in the raw cell lysate and dehydrogenase). This enzyme is an oxidoreductase that the flow through of our samples (Fig.2). This means + oxidizes NADH to NAD and reduces ubiquinone-8 to that either our protein was not eluted by our series of ubiquinol-8 within the cytoplasmic membrane (1). TN solutions, or that our protein did not bind to the Previous studies have shown that inactivation of this column at all. A previous study used DTT in the enzyme is caused by the lysozyme lysis method (8) and purification process (3). High concentrations of DTT 2+ more specifically, the EDTA and Mg required in this may have been a problem in previous studies since it method (5). Further, the only lysis method shown to reduces disulfide bonds, causing the protein to lose its conserve enzyme activity is via the French press (5,8) three-dimensional structure. Because of this reason, we left the dithiothreitol (DTT) out of our protocol. 8 Journal of Experimental Microbiology and Immunology (JEMI) Vol. 7:7-13 Copyright © April 2005, M&I UBC FIG. 2 The observed activity of NADH dehydrogenase after and before treatment on a DEAE ion exchange filter. However, DTT is commonly used to reduce suppressed roughly 40% of the original activity. disulfide bonds quantitatively and maintain monothiols Further increases of EDTA concentration to 6.3 mM in the reduced state (2). At low concentrations, DTT and 12.6 mM did not have a proportionate increase in stabilizes enzymes and other proteins which possess suppression. There is an optimal Ca2+ requirement for free sulfhydryl groups and has been shown to restore maximal NADPH dehydrogenase enzyme activity in activity lost by oxidation of these groups in vitro. It the plant Helianthus tuberosus, where even minimal seems that without DTT, our NADH dehydrogenase amounts of EDTA will chelate available Ca2+ (7). The may have in fact denatured and lost its activity.
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